如何从broadcastReceiver回调访问MainActivity

Question

I am new to Android development and managed to get this far reading questions and answers on StackOverflow. Thank you everyone.

I came up with a problem that I just can't figure out. I have seen similar problems posted but the answers are not clear to me. Please help me on this one.

I want to call a method on my main activity from another class. The app crashes when I try to call the method. Here is the code:

On the class file:

public class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        MainActivity MainActivity = new MainActivity();
        MainActivity.ligaInternet();
    }
}

On the mainactivity file:

protected void ligaInternet() {
    ConnectivityManager connMgr = (ConnectivityManager)
          getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo networkInfo = connMgr.getActiveNetworkInfo();
    if (networkInfo != null && networkInfo.isConnected()) {
        String urlText="http://www.regiprof.com/regiprof_sms.php";
        String stringUrl = urlText.toString();
        new DownloadWebpageTask().execute(stringUrl);
    } 
}

How can I call the ligaInternet() function?

Answer 1

you can try

MainActivity currentActivity = ((MainActivity)context.getApplicationContext()).getCurrentActivity();
currentActivity.ligaInternet();

Answer 2

try this. Dude, make the ligaInternet method static, only the static method can be referenced from class name. The statement MainActivity.ligaInternet() is now incorrect because ligaInternet() is a non static method hence it cannot be referenced from class name. and also remove the protected keyword from the method.

Answer 3

Possible method. Put the following inside your broadcast receiver.

Intent intent2open = new Intent(context, MainActivity.class)

And now inside MainActivity create a new method as follows:

public void onNewIntent (Intent intent) { 
 ligaInternet();
  // This simply calls the function.  
  //so make sure the function is 
  //written somewhere inside  
 //MainActivity as well.
}